Adjustable reamer



W. B'. JOHNSON.

ADJUSTABLE REAMEH.

,'APPLLCATION FILED FEB. 1o, 1919.

Patented Apr. 19, 1921.

29 and to exclude metal particles and abrasive matter. The collar may be se'- cured to the holder stem 3 by any suitable means, as a set screw-not shown-or the engagement of the forward end of the sleeve 34 may be relied upon to perform that function. The rear end of the sleeve 34 may be formed with the annular enlarged bore or chamber 38 which normally encompasses the holder abutment portion 7'.v

The numeral 39 indicates an annular adjustment nut mounted upon the screw threaded portion 40 of the plunger 14 which plunger extends beyond the end of the holder stem 3 and the sleeve 34 for that purpose, said nut having an annular shouldered portion 4:1.Which is arranged for rotation within the semicircular slot. In assembling` the spindle or plunger 14 and the nut 39 the shoulder 41 ofthe latter is passed through the chamber 38 eccentricallyA of the stem bore 5 and into the slot 8, the plunger 14 being thereafter screwed into the threads of the nut 39 until the desired position thereof is obtained.

Obviously, rotation of theadjustment nut 39 eifects a longitudinal movement of the plunger lll, thereby causing the cams l5 and 1G to engage the blade seats 12 and 13, whereby radial outward movement of the blades is effected, said nut 39 always remaining stationary, s0 far as longitudinal movement is concerned, on account of the engagement ofthe shoulder 4l with the slot 8.

For `rotatingthe reamer, when in use, suitable handles-not shown-may be fastened to the Sleeve 34, or the sleeve exterior may be formed for wrench engagement for that purpose.

I claim Y l. A metal cutting tool comprising` in combination, a body member or holder'pro vided with a central bore; a plurality of radially lnovable blades mounted in said holder; a longitudinallyY movable plunger mounted in said holder bore'and adapted to radially actuate said blades when longitudinally moved; and means for longitudinally actuating said plunger, said means comprising a revoluhle adjustmentnut sleeving said plunger, a. complementary spiral connection between said nut and said plunger, a slotted abutment member carried by said holder, and an annular shouldered member `carried by said nut and revolubly arranged Within said abutment slot.

2. In a metal cutting tool of the class described, a holder; a plurality of adjustable cutter blades mounted radially in said holder; a spring pressed collar slidably mounted upon said holder and adapted to inwardly actuate said blades; a spring seat collar movably mounted upon said holder: apd a sleeve member detachably mounted upon said holder and adapted to form an abutment for said spring seat collar.

3. In a metal cutting tool of the class dcscribed, a. holder; a pluralitjiv of adjustable cutter blades mounted adially in said holder; a` spring pressed collar slidably mounted upon said holder and adapted to inwardly aetuate said blades; and a sei-ond collar detachably mounted upon said bolder and provided with an extension ,which sleeves said spring pressed collar.

4. A metal cutting tool cmnprising. in combination, a holder provided with a central bore; a plurality of radially movabh` blades mounted in said holder; a longitudinally movable plunger mounted in said holder bore and adapted to radially actnate said blades When longitlulinally moved: a revoluble adjustment nut: a comple:ncni'ary spiral connection between said nut and said plunger; a complementar)r shoulder and slot connection between said nut aud said holder, whereby. when said nut is rotated. said plunger is longitudinally actuated; and a chambered member carried by the holder adjacent said shoulderand slot connection, the chamber whereof is adapted to enable the effec-tion of the shoulder and slot connection betweei'r said adjustment nut and said holder. y

ln testimon)v whereof l have hcreuntdaffixed my signature this 31st day of dan..

WiLLmM n. Joi-NsoN. 

